Open-hearth furnace.



L. L. KNOX & M. MURRAY.

OPEN HEARTH FURNACE. urmourn rman FEB/17, 190s.

Patented Apr. 20, 1909.

4 SHEETS-SHEET 1.

WITNESSES mvsnnon L., KNOX & M. MURRAY. OPEN HEARTH FURNACE.

' APPLICATION FILED FEB. 17, 1903.

919,184. Patnted Apr. 20, 1909. Y 2 .4 snnrs-snn1rr a.

-1; l g E a i:

I v I wiTmssslzs w 'INVENTORSI- WQMMW M mm: runs. Inc. Luna. vllsmnvoa. n. c,

L. L. KNOX & M. MURRAY.

OPEN HEARTH FURNACE. -APPLIGATION FILED FEB.17, 190s.

Patented Apr. 20, 1909.

4 SHEETS-SHEET 3 INVENTOHZ- wnnsssas L. L. KNOX 6c M. MURRAY.

OPEN HEARTH FURNACE.

AYPLIOATION FILED FEB. 17, 1908.

Patented Apr. 20, 1939.

4 SHEBTS-SHEET INVENTORS.'-

WITN asses UnrirnDsTAtrEs PACIT'ENT OFFICE. 5

a LIrrnEn L. .nnox; or BEN AVON, AND MONTGOMERY MURRAY; or WIL'KINSBURG, PENN- 7 SYLVANIA, ASSIGNORS TO KEYSTONE FURNACE CONSTRUCTION COMPANY, OFTPITTS- BURG, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA. V

omen-HEART FURNACE.

fBen-Qiibri, Allegheny county, Peiuisylvania,

and Monrreolusrzr MURRAY, of lVilkinsburg,

"Allegheny county, Pennsylvania, have invented a new and useful lniproreinent in Open-Hearth Furnaces, of which the follow-' ing is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in

which Figure 1 is a vertical section of a portion of an open hearth furnace, and showing one embodiment of our invention;- Fig. 2 is a front elevation of the same; Fig. 3 is a detail section taken on the line III-ill of Fig. 1; Fig. at is a similar section showing a modification; ig. 5 is a plan viewpartly in section of-one of the cooling boxes or plates; Fig. 6 is an end view of a furnace embodyingav modified forih of our invention; Fig. 7 is a horizontal section of the same taken on the line VH'VII of Fig. 8; and Fig. 8 is a vertical section on the line VIH J HI of Fig. 6. Fig. 9 is adeta'il sectional view of one of the cooling boxes.

Our invention has relation to open hearth furnaces,- and isdesigned to provide means of improved and effective character for protecting the gas and air ports of the furnaces from the destructive action of the heat and hot gases, and relates more particularly to a novel arrangement of cooling plates or boxes in the walls of the gas and air ports and to the construction .of the arch which separates the gas and air ports, and'to the manner of cooling the same.

The precise nature of our invention will be best understood y reference to'the'acconi panying drawings, in which we have shown several difierent embodiments thereof,and

'which will now be describechit being prennsed, however, that various changesmay be made therein by those skilled in the art without departing fro n'the spirit and scope of 1 our invention as defined in the --app'ended -claims.

Referring to the form of our invention meral '2 designates the wallsi'of a11 openhearth furnace, which IS in general of OlCll nary construction? 3 designates a portion'of Specification of Letters Patent.

Patented April 20, 1909.

Application filed February 17, 1908. Serial No. 416,185.

designates an air port, which is forked at its upper portion with branches 5, WhIClIBX- ,te'nd upwardly at opp'ositeflsides of the gas port, and which open into the furnace at 5* above the arch, which forms the separating wall between the discharge portions of the gas and air ports. The arch consists of a hollow box or casting 6, which extends across the top of the gas port with side portions or legs 6 (see Fig. .3), which extend a short distance down at opposite sides of the gas portand form a seat for the refractory lining 7, which constitutes that pontion of the arch which directly forms the upper wall of the gas port. The upper portion of the hollow box or casting-h forfns a seat for the refractory material 8, which constitutes the bottom of the air port 5". This arch is inserted through an opening 9 in the end wall of the furnace, and the box or casting 6 has an extension 10 outside the end wall of-the furnace, to whichare connected the water circulating pipes 11 and 12. \Ve preferably provide the box or casting 6 with interior longitudinally extending baffles 13, which provide for a proper circulation of the water .therein and keeps lnilowing water in con-- tact with the entire outer walls thereof. For this purpose, we preferably provide two inlet pipes 11, WhlEll lead into opposite side portions of the box, with a single central discharge pipe 12. The pipe 12 may be sup plied by suitable pipe or main 14. i The extension 10 of the box or casting 6 is preferably provided with means such as indicated at 15, for the engagement therewith of withdrawing ineans so that the entire arch can be removedfrom the furnace when burned out and a nei arch substituted. l6 designates a plurality of cooling boxes or plates, which are inserted into the outer vertical walls of the air and" gas ports, each port having its' ply pipe l'before referred to, the several boxes in each series being connected-by the pipes 18, each ofwhich lead from the highf which is-shown in Figs. 1,2 and 3, the nu- "the as aifd air )orts fronrcuttin awa' t: b I

under the destructive action of the hot gases when the furnace 1S reverse d, it being underhstood that the furnace is provided with a similar arrangement of ports at each end, in

accordance with the usual practice, and the direction of the entering gas and air and .of the out oing gases from the furnace being reversed in the usual manner. Each end of the furnace will have its ports provided with cooling means such asabove described. We

alsd preferably provide a cooling plate 16 in the joint between the upper and lower portions of the walls of the gas'and air flues.

In the modification shown in Fig. dithe hollow box or casting 6 in the arch between the gas and air ports, is formed with thedepending leg portions 6, which extend down at, opposite sides of the gas port to the bottom thereof. These legs terminate at'their lower. ends in the inward extensions 6, which form supports for the refractory side linings 7 for the port. In this manner this watercooled box or casting is made to carry the refractory lining for both the top and sides of the gas portan'd provides effective cooling means for these three walls of the port.

In the modification shown in. Figs. 6, 7, 8

and 9, there ai'e. three air ports, 19, and two gas ports 20, these ports being separated from each other by the intermediate walls or piers 21. their upper ends with the chamb 22, which opens into the end of the. furnace by the passage 23. In this construction, the arch 24 over the gas ports is built as an integral part of the walls of the'ports, and is cooled, by means of the hollow cooling plates or boxes 25 and 26.; These boxes 25 and'26 are openings in opposite side walls of the furintofa plurality ofseparate compartmentgi as shown in FigJ7, eaehcompartment hav- V "separ ajt 'gJwal between said ports an coninserted into chambers provided therefor within the masonry of the arch through nace, 1n the manner. shown in. Fig. 7 ,their inner ends being preferably separated from each other by an intervening wall'of refractory material '27. provided with the circulating connections 28 and 29, and with the interior 'bafllesBO.

The boxes 26 are provided Witht he valved circulating connections 31, and are divided ing its own circulating connections. In this manner, should the'compartment'nearest the entrance to the furnace become burned out, the water may be shut out of i that compartment and so on until the arch has burned backto the laStcOmpartment's of the boxes 26. NVe also preferably place in each of the intervening walls or piers 21- ports, a-coolingf between the gas and air box orplate 32, which isinserted into an opening into a chamber to receive-the same from the end of the furnace. These'cooling boxes 32 (one of which is shown in detail in Fig. 9), extend inwardly to the point where thegas ports discharge into the furnace, and effectively protect the side walls protected.

The air ports communicate at The boxes 25 are of these ports. We also preferably prqville also preferably provide the inner or rear wall of the uptake of the port with a cool ing box 36,which can'be inserted and ren'ewed in thesame manner.

By means of our. invention, the arches se arating the 'gas and air ports, together with the walls of the ports which are most subject to destructive action, are effectively The cooling plates or. boxes are readily accessible, and can be replaced and renewed when they are burned out. Our invention, therefore, greatly prolongs the of the ports as a whole, and limits the renewals and repairs to the portions thereof which can be readily removed and replaced. p J

It will be obvious that our invention is not limited to theparticula-r arrangement of cooling platesor boxes which we have here-*' in shown and described, since these ,may be arranged in various ways. The clrculat ng connect-ions mayalso be changed, asmay be' ,mostconvenient 1n any particular case, a s may also be the arrangement of battles w1thin the plates or boxes. It will. also. be

obvious that our invention is applicable'to other forms of regenerative reversing fur- The specific form of our invention which is shown in Figs. 6, T and 8 forms the subipct matterofa divisional application Serial umber 442,455, filed J uly'8th, 1908. -What we claim is z 7 In a furnace of the character described,- 'i having gas and air ports, an arch separating the said ports, said arch consisting of a water-cooled box or casting therein and-a reifr'actory covering for said-box or casting 'a' l bothits upper and lower. sides, said fQov-' 1e ngbein supported by the box or. casting;

. -'2.: "ace of the type v described having gas'a 1r orts, an arch.- formin' the ,Sarchseparating the gas an faint-ports, said archconsisting of a-holl'ow water-cooled boa;

or casting, refractory coverings; supported .by said box 'or-castingat both itsupper and.

lower sidesysaid box or casting, together with its'coverings', beingbodily removable through the wallsof the ports, and 'circulat 11. manner similar to the boxes 25 and 26. We

ing p pes connected to an ez'ztensi'on of the box or casting and exteriorly of the end 'wall; substantially as described.

or extensions at its sides which extend downwardly at opposite sides -of the gas port, a refractory lining forming the upper and lateral walls of the gas port supported by said casting, and a refractory covering forming the bottom of the airport and also sup ported by said box or casting; substantially as described.

5. In a reversing, regenerative furnace, a removable arch separating the gas and air ports, said arch consisting of a hollow watercooled box or casting and a' body of refractory material surrounding and supported by said box or casting, substantially as described.

6. I11 a reversing, regenerative furnace, a removable arch separating the gas and air ports, said arch consisting of a hollow watercooled box or casting provided with downwardly-extending lateral legs or extensions of said casting, and a body of refractory material supported by said legs or extensions, substantially as described.

7. In a furnace of the character described, a removable arch separating the gas and air ports, said'arch consisting of a hollow watercooled box or casting formed with depending lateral portions or legs, and refractory material supported by said legs and forming the roof of the gas ,port; substantially as described.

8. In a furnace of the character described, a removable arch separating the gas and air ports, said arch consisting of a hollow watercooled box or casting formed with depending lateral portions or legs, and refractory material supported by said legs and forming the roof and also the lateral walls -of the gas port; substantially as described.

9. A furnace of the character described, having a gas port leading into the furnace, and removable water-cooled boxes within the lower wall of said port; substantially as clescribed.

10. A furnace of the character described, having a gas port leading into the furnace, and removable water-cooled boxes within the lower and inner walls of said port; substantially as described.

' 11. In a furnace of the character described, an arch separating the gas and air ports and containing a water-cooled box or casting having lateral depending skew-backs; substantially as described.

19.. In a furnace of the type described, an arch separating the gas and air fines, said arch being bodily removable and having hollow side members, together with means for circulating water therethrough, and. up-

per and lower refractory material carried by said side members, substantially as described. '13. A furnace of the type described, having. anarch separating its gas and an .flues, said arch having hollow side members supported on the side walls of the furnace and carrying upper and lower refractory ma: terial, and means for effecting a water circulation' through said side members, substantially as described.

14. In a furnace of the character described, an arch separating the gas and air fines, said arch having hollow longitudinally extending side members formed with downwardly extending water legs, said side members and the downwardly extending water legs supporting and carrying the upper and side walls of the gas flue, together. with connections for circulating water through said side members, substantially as described.

15. In a furnaceof the character described, an arch separating the air and gas fines, said arch having hollow metallic side members formed with downwardly extending water legs which support the refractory top and side walls of the gas flue, and arefractory bottom for the air flue also carried by said side members, together with conlie'ctions for circulating avater through said side members, substantially as described.

16. In a furnace of the character described, having gas and air ports, an arch formin the separating wall between said ports,'sai arch having a water-cooled box or casting and a refractory lining or covering on both sides of the casting, said arch being bodily removable in a horizontal direction throu h a wall of the furnace; substantially as escribed.

17. In a furnace of the type described, having adjacent gas and air ports separated by a wall, and hollow water-cooled plates or boxes inserted in the wall between said ports and removable through an opening in a vertical wall of the furnace; substantially as described.

18. A furnace of the type described having gas and air ports, an arch separating said ports, and hollow water-cooled boxes or castings extending intosaid arch, saiclarch being bodily removable through one of the vertical walls of the furnace; substantially as described. I

19. A cooler for the mouths of the air and .gas ports of open hearth furnaces, comprising an arched hollow water-cooled casing having hollow extensions or skew-backs at the ends of the casing. v

In testimony whereof, we have hereunto set our hands.

LUTHER L. KNOX. MONTGOMERY MURRAY. Vitne'sses GEO. B. BLEMIXG, R. A. BALDERSON. 

